Frost dates · USDA zone 9a
Frost dates for Beaverton, OR
Beaverton, OR sees its last 32 °F night of spring around February 11 and its first of fall around December 5 — a 303-day freeze-free season in a typical year.
Pick a sauce; the Plan Builder runs this station's dates and hands back the calendar, plant count and gear list.
Freeze odds, by date
| Odds | Last spring freeze after | First fall freeze before |
|---|---|---|
| 9 years in 10 | Dec 26 (prior winter) | Jan 12 (next year) |
| Median — 1 year in 2 | Feb 11 | Dec 5 |
| 1 year in 10 | Mar 5 | Nov 11 |
The top row is the risky edge: in 9 years of 10 a spring freeze still comes after it, so tender transplants set out then need cover. The bottom row is the cautious date — only 1 year in 10 freezes after it — and the one to plan uncovered tender transplants against. Freeze-free season: 303 days median, at least 264 in 9 years of 10, at least 344 days in 1 year of 10. NOAA ranks season length year by year, so it is not the gap between two rows above. A hard freeze (28 °F) has a median last date of Jan 6 and first of Dec 21.
Beaverton planting calendar, 2027
Every row runs from the median last frost (Feb 11) and median first frost (Dec 5) above, using each cultivar's days to maturity. Same engine as the Plan Builder.
| Crop | Start indoors | Transplant / plant | First harvest | Days |
|---|---|---|---|---|
| Hardneck GarlicSiberian (porcelain hardneck) | — | Oct 15prior fall | Jun 12 | 240 from sow |
| Spanish OnionYellow Sweet Spanish (long-day) | Nov 19 | Jan 14 | May 4 | 110 from transplant |
| Mustard greensGarnet Giant (Brassica juncea) | Direct sow | Feb 11 | Mar 13 | 30 from sow |
| CilantroSlow Bolt (Coriandrum sativum) | Jan 28 | Jan 28 | Mar 14 | 45 from sow |
| Genovese BasilGenovese | Jan 14 | Feb 25 | Apr 26 | 60 from transplant |
| CayenneLong Slim Cayenne (Capsicum annuum) | Dec 17 | Feb 18 | May 4 | 75 from transplant |
| HabaneroOrange Habanero (Capsicum chinense) | Dec 3 | Feb 25 | May 31 | 95 from transplant |
| JalapeñoEarly Jalapeño (Capsicum annuum) | Dec 17 | Feb 18 | May 4 | 75 from transplant |
| Marconi Red PepperMarconi Red (Capsicum annuum) | Dec 17 | Feb 18 | May 9 | 80 from transplant |
| SerranoSerrano Tampiqueño (Capsicum annuum) | Dec 17 | Feb 18 | May 9 | 80 from transplant |
| Nantes CarrotScarlet Nantes | Jan 28 | Jan 28 | Apr 8 | 70 from sow |
| TomatilloToma Verde | Dec 31 | Feb 18 | Apr 29 | 70 from transplant |
| Roma TomatoRoma VF (determinate paste) | Dec 31 | Feb 18 | May 4 | 75 from transplant |
| San Marzano TomatoSan Marzano (indeterminate paste) | Dec 31 | Feb 18 | May 9 | 80 from transplant |
Tight means first harvest lands within two weeks of the median first fall frost: start that crop indoors on time or cover it in fall.
What sauce can Beaverton grow?
Each sauce, scheduled for a Beaverton container garden: when the first seeds go in and when enough fruit has ripened for one batch.
Beaverton frost questions
When is the last frost in Beaverton, OR?
The median last 32 °F freeze at NATURE PARK-BEAVERTON, OR is February 11: half of years see a later one. One year in ten, a freeze still comes after March 5; nine years in ten, it comes after December 26 (prior winter). Source: NOAA NCEI 1991–2020 U.S. Climate Normals.
When is the first frost in Beaverton, OR?
The median first 32 °F freeze of fall is December 5. One year in ten it arrives before November 11; nine years in ten, before January 12 (next year).
How long is the growing season in Beaverton, OR?
303 days between the last spring and first fall 32 °F freeze in a median year. Nine years in ten the season runs at least 264 days; one year in ten, at least 344 days.
What growing zone is Beaverton, OR?
USDA hardiness zone 9a, per the 2023 USDA Plant Hardiness Zone Map for ZIP 97005. A zone describes the coldest winter night, not when frost ends, so it is the wrong number for a planting calendar — the frost dates on this page are the right one.
When should I plant tomatoes in Beaverton, OR?
Start Roma VF (determinate paste) seeds indoors around Dec 31 and transplant around Feb 18, 1 week after the median last frost. To cut the freeze risk to one year in ten, wait for Mar 5. First ripe fruit lands around May 4.
When should I plant peppers in Beaverton, OR?
Sow jalapeño indoors on a heat mat around Dec 17; transplant no earlier than Feb 18, and wait past it until nights hold above 50 °F — that can run weeks later. First green pods around May 4.
Nearby in Oregon
- Tigardlast frost Apr 1
- Hillsborolast frost Apr 16
- Portlandlast frost Feb 25
- Greshamlast frost Mar 16
- Salemlast frost Apr 3
- Albanylast frost Apr 17
All Oregon frost dates → · How frost-date math drives a sowing calendar →